100 



THE OPlllUKlDiE. 



IL DESCRIPTION OF SPECIES 



1. Ophioderma panamensis Ltk. 



LuTKEN : Adaitamwita ad Hist. Oph., Part IL p. 193. 



Panama. 1 specimen. 



mt 



t 



2. Ophioderma variegata LtL 



» 



Plato I. Figs. 1-3. 



LiJTKEN : Op cit.j Part II. p. 199. 



To this species we refer a specimen from Panama, although it seems at 

 first sight to differ rather widely therefrom, the disk being almost entirely 

 destitute of the granula3 with which the species of Ophioderma commonly 

 are covered, and instead thereof being covered with small, irregular, not 

 overlapping scales, among which the primary plates are not to be seen. In 

 all other respects it closely resembles the 0. variegata. However, there are 

 seen by closer examination some granula) here and there, in spots, where they 

 have been protected from being rubbed off, as especially at the arm-bases on 

 the under side of the disk. It is therefore almost sure that there have 

 been granular covering the whole disk. Also the arm-spines and the tentacle 

 scales have mostly been broken off.' This has caused an error in Figure 1 : 

 only one tentacle scale is seen there ; after the figure had been reproduced, 

 we found traces of the outer tentacle scale also, so that there will not be 

 any difference from other species of Opliiodcrma in this respect. The color 

 also corresponds to that of the two specimens of 0. variegata^ which are pre- 

 served in the Museum at Copenhagen ; the arms are colored alternately with 

 dark brown and white (faintly reddish) bands, each band enclosing 2-3 joints. 

 In the figures of this species, (which has not been previously figured,) it is 

 represented without the covering of granute. In the other species of 

 Opldoderma there will be a similar covering of scales beneath the granular. 



On Figure 1, there is seen at the inner edge of the second ventral plate a 

 pair of small pores, whose significance is Avholly unknown to us. The same 

 pores we found in all the species of Ophioderma which we have examined ; 







